Sliding window and door lock



Il n' INVENTOR HERMAN H. K|sTNE.R

I 0 3 43a33m c l 2 o H/ S ATTORNEY5.

Aug. 5, 1958 H. H. KlsTNER summe wmnowmn nooR Locx Filed Sept. 10, 1956United States Patent O SLIDING WINDOW AND DOOR LOCK Herman H. Kistner,Glen Ridge, N. J. Application September 10, 1956, Serial No. 608,865 sclaims. (cl. 70490) This invention relates to window sash and slidingdoor locks and similar devices, and is an improvement on the closurebolting and locking means described in my Patent No. 2,076,897, datedApril 13, 1937, as the result of experience and the demand for a betterlock of this type.

In the process of installing locks of the kind illustrated in my patent,particularly in a window sash made of very hard wood, difficulties havebeeen encountered due to the hardness of the wood and to slightinaccuracy in the size of the hole made for the lock, causing the boltto bind in the outer shell or causing the shell to interfere with theweather stripping, and weakness of the coil spring or other defect inthe construction of the lock has permitted the bolt to be turned andwithdrawn by means other than the proper key, and endangering theweather tightnes of the window or the security of the lock in suchcases.

These, and other shortcomings met with in actual installations over aperiod of some twenty years, have now been overcome by my improvements,as hereinafter described, with reference to the embodiments of theinvention shown in the accompanying drawings, wherein like referencenumbers represent the same parts in the several views.

In the drawings, Fig. 1 is a vertical section through the meeting railsof a sliding sash window showing the lock shell and keeper in axialcross section and the bolt in side elevation in unlocked position; andFig. 2 is similar view showing a key in the lock and the bolt in partlylocked position turned at 45 to its position in Fig. l.

Fig. 3 is a horizontal axial cross-section on the line 3-3 in Fig. 1,showing the bolt in fully locked position; and Fig. 4 and Fig. 5 aretransverse vertical cross-sections on the line 4 4 in Fig. 2, and 5-5 inFig. 3, respectively.

Figs. 6 and 7 are a side view and an end view of a shell intendedprimarily 'for metal frames; and Figs. 8 and 9 are similar views of amodied form of shell adapted for both wood and meta-l frames, theseshells preferably being somewhat smaller than the shell illustrated inFigs. 1 to 5.

Fig. 10 is a disassembled perspective view of the shell, bolt, actuatingspring, locking pin, and keyway wards, the key itself being similar tothat shown in Fig. 6 of my prior Patent No. 2,076,897.

My improved closure bolting and locking means has all the advantages ofmy patented device, namely, few working parts of simple ruggedconstruction which are easily installed, and which may be positioned atany desired part of the meeting members to be locked together so as tobe invisible from the exterior and which cannot be opened from theexterior without demolishing one of the locked members.

Other advantages will appear from the following description of apreferred form of the invention as applied In the illustrativeembodiment of the invention shown herein (see Figs. l to 5), a tubularbody or shell 11, housing the sliding bolt 12, is mounted in the upperrail 13 of the lower sash of a sliding window with its axis horizontaland at right angles to the plane of the window, and a thimble 14 ismounted in the lower rail 15 of the upper sash with its axis inalinement with the axis of the bolt when the window is closed. Thethimble 14 is preferably made of hardened steel and may be provided witha iiange 16 which is secured to the rail 15 by small screws 17 to holdit in place in a suitable opening on the inside of the rail in which itis a force lit. The bolt 12 is also made of hardened steel, so that whenengaged in the thimble it cannot be sawed or cut through by any meansthat can bebrought to bear on either of these two members.

The shell 11 is provided with an internal shoulder 18 at its endadjacent to the upper sash, which for convenience will be referred to asthe inner end of the shell because it is forced into a suitable bore inthe sash from the opposite direction. A spring 19 within the shell isprovided for retracting the bolt 12, and this spring also retains thebolt in locking position. When assembled in the shell 11 the spring 19is compressed in place, with one end abutting against the inner shoulder18 and the other end pressing against a ange 20 on the bolt 12 near itsmiddle to force it toward the large open end of the shell when thelocking pin 21 in the bolt is in alinement with the lengthwise portion22 of the locking groove 23 in the circumference of the shell 11. Thislocking groove has a notch 24 at its dead-locking end to retain the boltin its locking position as in my Patent No. 2,076,897.

,The transverse portion of the groove 23 is provided with a notch 25 onthe inner side of its cross wall forming a trap for the pin 21, and thebolt itself is formed with a projecting nubbin or 'point 26 at its outerend, which cooperates with the notch 25 to prevent unlocking the bolt bya screw-driver or small implement such as a pencil with an eraser on itsend. It has been found that such an instrument can be substituted forthe special key supplied with the lock and inserted in the open end ofthe shell so as to apply pressure on the end of the bolt in my patentedlock and dislodge the locking pin 21 from the groove 24, whereuponrotation of the instrument while applying sufficient pressure to thebolt to develop friction vbetween the rubber and the fiat end of thebolt can result in turning it suiiiciently to free the bolt,particularly should the spring 19 be abnormally weak because ot age,abuse, or other cause. But, in my improved lock the notch 25 is sopositioned as to catch the pin 21 and prevent further rotation of thebolt by such an illicit mode of operation. Thus my new lock is asubstantial improvement upon the patented one and no more costly tomanufacture because of this feature.

The bolt 12 and spring 19 may be assembled and disassembled in the shell11 by inserting them in the open end of the shell and inserting the pin21 laterally through the groove 22 in the shell into the transverseopening 28 in the outer end of the bolt. A drive out hole 29 is providedin the shell in transverse alinement with the pin 21 when the bolt is inlocking position to permit the pin to be driven out of the bolt wheneverit is necessary to dismantle the lock.

The shell is provided with inside guards in the form of small pins 30such as drive screw pins, which project into its interior at spacedpoints and stand in the way of the insertion of any sort of implementother than a key provided with matching longitudinal channels 31 asPatented Aug. 5, 19,58

shown in Fig. 2. circumferential channels 32 permit the key 33 to berotated after it has been inserted into the shell far enough to engagethe bolt 12 with its keeper 14, this rotation serving to turn thelocking pin 21 in the groove 23 so as to permit it to enter the lockingnotch 24 under the action of the spring 19 upon releasing the inwardpressure on the key, thereby dead locking the bolt in its engagedposition with the keeper 14.

ln order to prevent deiiection of the` side wall of the shell adjacentto the slots 22, 23 and notch 24 by pressure on its exterior when driveninto hard wood, the ange 20 on the bolt is made wide enough to projectunder and support this lip portion of the shell in the withdrawn orunlocked position of the bolt, thereby eliminating trouble heretoforeexperienced with this type of bolt lock due to binding of the bolt inthe shell when the latterhas been forced into a tight tit in a hard woodsash.

` The outer surface at the inner end 35 of the shell is reduced indiameter sutliciently to prevent it from splitting the edge of the borein the wood in which it may be installed or from interfering with theweather stripping (not shown) with which many sliding sash windows arefitted.

Figs. 6 to 9 illustrate shells for metal window and metal sliding doorframes which are secured by screwing them into suitable holes bored inthe outer and inner walls thereof. The inner or the outer wall of thewindow or door may be threaded to iit screw threads turned on the outersurface of the shell, which may be smooth or knurled otherwise.

In Figs. 6 and 7, the key receiving end of the shell 40 is enlarged andprovided with threads 41, and lengthwise channels 42 are made in theouter surface of the threaded portion of the shell to receive thel headsof the drive screw pins 43 to prevent interference between the latterand the metal wall of the window or door when the lock is installed. Theinner end of the shell may be knurled, as shown in Fig. 6; or thethreads 44 may be out -on the inner end of the shell 4S and the outerend left plain as shown in Fig. 8. In the latter case, the drive screwpins 46 will have countersunk heads, as in Figs. 8 and 9, tiush with theouter surface of the shell 45. The shells 40, 45 may be readilyscrewedinto place by means of a grooved implement similar to the key 33,whereby the longitudinal grooves 31 will engage with the pins 30, 43 or44 to rotate the shell and cause the screw threads on the shell toengage those of the inner or outer wall of the window or door.

The shell may be threaded on both ends and engage in threaded openingsin both the inner and outer walls of the window or door, in which casethe openings in the inside walls must be suiciently larger than those inthe outside walls to permit the inner threaded end of the shell to passthrough the inside wall freely to engage the threads of the outside wallat about the same time that the threads on the outer threaded end of theshell engage the threads of the inside wall.

For metal windows and doors the shells may be somewhat smaller inlength, and also smaller in diameter,

than for wooden windows and doors to conform with the thinnerconstruction of the former, the working parts being proportionallydiminished in size. The finish of the shell and exposed parts of thelock may also be adapted lto that of the windows or doors upon whichthey are to be used.

The invention is not restricted to the exact forms and materials asdescribed herein, but what I claim is as follows:

l. A key operated sliding bolt lock for closures comprising a boltrotatably and slidably mounted in a tubular casing to project therefromat one end in locking position, said bolt having a transverse pinprojecting from near its end remote from its bolting end and anintermediate shoulder between said pin and bolting end, and said casinghaving 'an inner shoulder at the bolting end and its opposite end beingopen to receive a key, a channel extending longitudinally in the sideWall -of said casing toward its key receiving end to receive said pin,said channel terminating at a lateral abutment remote from said keyreceiving end extending circumferentially and functioning as abayonetslot, the wall of said slot on its side remote from said keyreceiving end having a notch at an intermediate point serving as a trapfor said pin and the end of the wall of said slot remote from saidchannel having a notch extending axially towards said key receiving endand serving as a retaining means for preventing unlocking movement ofsaid pin, a spring in said casing surrounding said bolt between theshoulder in the casing and the shoulder on said bolt, said springvpressing said bolt towards the key receiving end of said casing toretract it when said pin is in alinement with said channel.

2. A keyv operated sliding bolt lock for closures as set forth in claiml wherein the key receiving end of the bolt is provided with an axialprotuberance preventing contact between the greater part of the end ofthe bolt and a fiat ended implement inserted in the key receivingopening.

3. A key operated sliding bolt locky for closures as set forth in claiml wherein an end of the casing is threaded on its exterior to engage ina threaded opening in one wall of a metal closure member.

Y 4. A key operated sliding bolt lock for closures as set forth in claiml wherein the intermediate shoulder on the bolt is in the form of a wideange underlying and supporting that portion of the wall of the casingadjoining` said bayonet slot and channel when said bolt is in retractedposition.

5. A key operated sliding bolt lock for closures as set forth in claim lwherein the casing is provided with an opening through its side wall inalinement with the transverse pin in its locking position permittingdislodgment of said pin from said bolt in disassembling said lock.

References Cited in the le of this patent UNITED STATES PATENTS 909,933Price Jan. 19, 1909 2,098,189 Kstner Nov. 2, 1937 2,098,249 Kistner Nov.9, 1937

